The staff had a specific agenda. Yes they took Small. But it can assumed that they do have a plan for a player like him, and he was the key to Omari Thomas. With that in mind, look at the other two RBs they took 6'1 225 and 6'2 230. That was "filling the need"
They dont want to keep pulling Crouch over to offense to convert a 3rd and short.
They didn't really want Small but they took him. Gibbs is a completely different style of RB than Hodge ot Whitehead
So they didn't want him.
Gibbs probably outrushes them in his college career, but the staff had a specific goal and Gibbs wasn't a fit. So it's not about who's "better ". It's about fit..